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        <p>上一篇讲完了<code>initServer</code>的大体流程，其中<code>aeCreateEventLoop（）</code>,这个函数没有详细说明，我们在这一篇里讲述<code>Ae.h和Ae.c</code>, 这里面的api阐述了如何创建</p>
<p><code>eventLoop</code>和添加文件读写事件等等。</p>
<p>ae.h中的解释</p>
<p>//文件读写事件回调函数<br><code>typedef void aeFileProc(struct aeEventLoop *eventLoop, int fd, void *clientData, int mask);</code></p>
<p>//定时器回调函数<br><code>typedef int aeTimeProc(struct aeEventLoop *eventLoop, long long id, void *clientData);</code><br>//事件结束回调函数，析构一些资源<br><code>typedef void aeEventFinalizerProc(struct aeEventLoop *eventLoop, void *clientData);</code><br>//不是很清楚，应该是进程结束前做的回调函数<br><code>typedef void aeBeforeSleepProc(struct aeEventLoop *eventLoop);</code><br><a id="more"></a><br><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//文件事件回调函数</span></span><br><span class="line"> <span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">aeFileEvent</span> &#123;</span></span><br><span class="line">     <span class="keyword">int</span> mask; <span class="comment">/* one of AE_(READABLE|WRITABLE) */</span> <span class="comment">//文件事件类型 读/写</span></span><br><span class="line">     aeFileProc *rfileProc;</span><br><span class="line">     aeFileProc *wfileProc;</span><br><span class="line">     <span class="keyword">void</span> *clientData;</span><br><span class="line"> &#125; aeFileEvent;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* A fired event */</span></span><br><span class="line"> <span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">aeFiredEvent</span> &#123;</span></span><br><span class="line">     <span class="keyword">int</span> fd;    <span class="comment">////已出现的事件的文件号对应的事件描述在aeEventLoop.events[]中的下标</span></span><br><span class="line">     <span class="keyword">int</span> mask;  <span class="comment">//文件事件类型 AE_WRITABLE||AE_READABLE</span></span><br><span class="line"> &#125; aeFiredEvent;</span><br><span class="line"></span><br><span class="line"> <span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">aeTimeEvent</span> &#123;</span></span><br><span class="line">     <span class="keyword">long</span> <span class="keyword">long</span> id; <span class="comment">/* time event identifier. */</span>  <span class="comment">//由aeEventLoop.timeEventNextId进行管理</span></span><br><span class="line">     <span class="keyword">long</span> when_sec; <span class="comment">/* seconds */</span></span><br><span class="line">     <span class="keyword">long</span> when_ms; <span class="comment">/* milliseconds */</span></span><br><span class="line">     aeTimeProc *timeProc;</span><br><span class="line">     aeEventFinalizerProc *finalizerProc;</span><br><span class="line">     <span class="keyword">void</span> *clientData;</span><br><span class="line">     <span class="class"><span class="keyword">struct</span> <span class="title">aeTimeEvent</span> *<span class="title">next</span>;</span></span><br><span class="line"> &#125; aeTimeEvent;</span><br><span class="line"></span><br><span class="line"> <span class="comment">/* State of an event based program */</span></span><br><span class="line"> <span class="keyword">typedef</span> <span class="class"><span class="keyword">struct</span> <span class="title">aeEventLoop</span> &#123;</span></span><br><span class="line">     <span class="keyword">int</span> maxfd;   <span class="comment">//监听的最大文件号  </span></span><br><span class="line">     <span class="keyword">int</span> setsize; <span class="comment">//跟踪的文件描述符最大数量</span></span><br><span class="line">     <span class="keyword">long</span> <span class="keyword">long</span> timeEventNextId;     <span class="comment">//定时器事件的ID编号管理（分配ID号所用）</span></span><br><span class="line">     <span class="keyword">time_t</span> lastTime;     <span class="comment">/* Used to detect system clock skew */</span></span><br><span class="line">     aeFileEvent *events; <span class="comment">//注册的文件事件，这些是需要进程关注的文件</span></span><br><span class="line">     aeFiredEvent *fired;  <span class="comment">//poll结果，待处理的文件事件的文件号和事件类型  </span></span><br><span class="line">     aeTimeEvent *timeEventHead; <span class="comment">//定时器时间链表</span></span><br><span class="line">     <span class="keyword">int</span> stop;   <span class="comment">//时间轮询是否结束？</span></span><br><span class="line">     <span class="keyword">void</span> *apidata;  <span class="comment">//polling API 特殊的数据</span></span><br><span class="line">     aeBeforeSleepProc *beforesleep;  <span class="comment">//休眠前的程序</span></span><br><span class="line"> &#125; aeEventLoop;</span><br></pre></td></tr></table></figure></p>
<p> /<em> Prototypes </em>/<br> //创建eventLoop结构<br> <code>aeEventLoop *aeCreateEventLoop(int setsize);</code><br> //删除eventloop<br> <code>void aeDeleteEventLoop(aeEventLoop *eventLoop);</code><br> //事件派发停止<br> <code>void aeStop(aeEventLoop *eventLoop);</code><br> //添加文件读写事件<br> <code>int aeCreateFileEvent(aeEventLoop *eventLoop, int fd, int mask,
     aeFileProc *proc, void *clientData);</code><br> //删除文件读写事件<br> <code>void aeDeleteFileEvent(aeEventLoop *eventLoop, int fd, int mask);</code><br> //获取文件事件对应类型(读或写)<br> <code>int aeGetFileEvents(aeEventLoop *eventLoop, int fd);</code><br>//创建定时器事件<br> <code>long long aeCreateTimeEvent(aeEventLoop *eventLoop, 
     long long milliseconds,aeTimeProc *proc, void *clientData,
     aeEventFinalizerProc *finalizerProc);</code><br> //删除定时器事件<br> <code>int aeDeleteTimeEvent(aeEventLoop *eventLoop, long long id);</code><br> //派发事件<br> <code>int aeProcessEvents(aeEventLoop *eventLoop, int flags);</code><br> //等待millionseconds直到文件描述符可读或者可写<br> <code>int aeWait(int fd, int mask, long long milliseconds);</code><br> //ae事件轮询主函数<br> <code>void aeMain(aeEventLoop *eventLoop);</code><br> //获取当前网络模型<br> <code>char *aeGetApiName(void);</code><br> //进程休眠前回调函数<br> <code>void aeSetBeforeSleepProc(aeEventLoop *eventLoop, 
     aeBeforeSleepProc *beforesleep);</code><br> //获取eventloop所有的事件个数<br> <code>int aeGetSetSize(aeEventLoop *eventLoop);</code><br> //重新设置eventloop事件个数<br> <code>int aeResizeSetSize(aeEventLoop *eventLoop, int setsize);</code></p>
<p> ae.cpp中，一个函数一个函数解析</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//定义了几个宏，根据不同的宏加载</span></span><br><span class="line"><span class="comment">//不同的网络模型</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> HAVE_EVPORT</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">"ae_evport.c"</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">else</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> HAVE_EPOLL</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">"ae_epoll.c"</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">else</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">ifdef</span> HAVE_KQUEUE</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">"ae_kqueue.c"</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">else</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">"ae_select.c"</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">endif</span></span></span><br></pre></td></tr></table></figure>
<p> <code>aeCreateEventLoop,主要负责eventloop结构的创建和初始化，以及模型的初始化</code></p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">aeEventLoop *<span class="title">aeCreateEventLoop</span><span class="params">(<span class="keyword">int</span> setsize)</span> </span>&#123;</span><br><span class="line">    aeEventLoop *eventLoop;</span><br><span class="line">    <span class="keyword">int</span> i;</span><br><span class="line">    <span class="comment">//创建eventloop</span></span><br><span class="line">    <span class="keyword">if</span> ((eventLoop = zmalloc(<span class="keyword">sizeof</span>(*eventLoop))) == <span class="literal">NULL</span>) <span class="keyword">goto</span> err;</span><br><span class="line">    <span class="comment">//为进程要注册的文件开辟空间</span></span><br><span class="line">    eventLoop-&gt;events = zmalloc(<span class="keyword">sizeof</span>(aeFileEvent)*setsize);</span><br><span class="line">    <span class="comment">//为激活的要处理的文件开辟空间</span></span><br><span class="line">    eventLoop-&gt;fired = zmalloc(<span class="keyword">sizeof</span>(aeFiredEvent)*setsize);</span><br><span class="line">    <span class="comment">//开辟失败报错</span></span><br><span class="line">    <span class="keyword">if</span> (eventLoop-&gt;events == <span class="literal">NULL</span> || eventLoop-&gt;fired == <span class="literal">NULL</span>) <span class="keyword">goto</span> err;</span><br><span class="line">    <span class="comment">//设置监听事件总数</span></span><br><span class="line">    eventLoop-&gt;setsize = setsize;</span><br><span class="line">    <span class="comment">//更新为当前时间</span></span><br><span class="line">    eventLoop-&gt;lastTime = time(<span class="literal">NULL</span>);</span><br><span class="line">    eventLoop-&gt;timeEventHead = <span class="literal">NULL</span>;</span><br><span class="line">    eventLoop-&gt;timeEventNextId = <span class="number">0</span>;</span><br><span class="line">    eventLoop-&gt;stop = <span class="number">0</span>;</span><br><span class="line">    eventLoop-&gt;maxfd = <span class="number">-1</span>;</span><br><span class="line">    eventLoop-&gt;beforesleep = <span class="literal">NULL</span>;</span><br><span class="line">    <span class="comment">//将不同模式的api注册到eventloop里</span></span><br><span class="line">    <span class="keyword">if</span> (aeApiCreate(eventLoop) == <span class="number">-1</span>) <span class="keyword">goto</span> err;</span><br><span class="line">    <span class="comment">/* Events with mask == AE_NONE are not set. So let's initialize the</span></span><br><span class="line"><span class="comment">     * vector with it. */</span></span><br><span class="line">    <span class="keyword">for</span> (i = <span class="number">0</span>; i &lt; setsize; i++)</span><br><span class="line">        <span class="comment">//将所有文件事件类型初始为空</span></span><br><span class="line">        eventLoop-&gt;events[i].mask = AE_NONE;</span><br><span class="line">    <span class="keyword">return</span> eventLoop;</span><br><span class="line"></span><br><span class="line">err:</span><br><span class="line">    <span class="keyword">if</span> (eventLoop) &#123;</span><br><span class="line">        zfree(eventLoop-&gt;events);</span><br><span class="line">        zfree(eventLoop-&gt;fired);</span><br><span class="line">        zfree(eventLoop);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> <span class="literal">NULL</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//事件队列大小和重置 </span></span><br><span class="line"> </span><br><span class="line"><span class="comment">//获取eventloop事件队列大小</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">aeGetSetSize</span><span class="params">(aeEventLoop *eventLoop)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> eventLoop-&gt;setsize;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//重新设置大小</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">aeResizeSetSize</span><span class="params">(aeEventLoop *eventLoop, <span class="keyword">int</span> setsize)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">int</span> i;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> (setsize == eventLoop-&gt;setsize) <span class="keyword">return</span> AE_OK;</span><br><span class="line">    <span class="keyword">if</span> (eventLoop-&gt;maxfd &gt;= setsize) <span class="keyword">return</span> AE_ERR;</span><br><span class="line">    <span class="comment">//不同的网络模型调用不同的resize</span></span><br><span class="line">    <span class="keyword">if</span> (aeApiResize(eventLoop,setsize) == <span class="number">-1</span>) <span class="keyword">return</span> AE_ERR;</span><br><span class="line">    <span class="comment">//重新开辟空间</span></span><br><span class="line">    eventLoop-&gt;events = zrealloc(eventLoop-&gt;events,<span class="keyword">sizeof</span>(aeFileEvent)*setsize);</span><br><span class="line">    eventLoop-&gt;fired = zrealloc(eventLoop-&gt;fired,<span class="keyword">sizeof</span>(aeFiredEvent)*setsize);</span><br><span class="line">    eventLoop-&gt;setsize = setsize;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* Make sure that if we created new slots, they are initialized with</span></span><br><span class="line"><span class="comment">     * an AE_NONE mask. */</span></span><br><span class="line">    <span class="comment">//重新初始化事件类型</span></span><br><span class="line">    <span class="keyword">for</span> (i = eventLoop-&gt;maxfd+<span class="number">1</span>; i &lt; setsize; i++)</span><br><span class="line">        eventLoop-&gt;events[i].mask = AE_NONE;</span><br><span class="line">    <span class="keyword">return</span> AE_OK;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p> <code>删除eventloop和stop事件轮询</code></p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//删除eventloop结构</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">aeDeleteEventLoop</span><span class="params">(aeEventLoop *eventLoop)</span> </span>&#123;</span><br><span class="line">    aeApiFree(eventLoop);</span><br><span class="line">    zfree(eventLoop-&gt;events);</span><br><span class="line">    zfree(eventLoop-&gt;fired);</span><br><span class="line">    zfree(eventLoop);</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//设置eventloop停止标记</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">aeStop</span><span class="params">(aeEventLoop *eventLoop)</span> </span>&#123;</span><br><span class="line">    eventLoop-&gt;stop = <span class="number">1</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p> <code>创建监听事件</code></p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//创建监听事件</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">aeCreateFileEvent</span><span class="params">(aeEventLoop *eventLoop, <span class="keyword">int</span> fd, <span class="keyword">int</span> mask,</span></span></span><br><span class="line"><span class="function"><span class="params">                      aeFileProc *proc, <span class="keyword">void</span> *clientData)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="comment">//判断fd大于eventloop设置的事件队列大小</span></span><br><span class="line">    <span class="keyword">if</span> (fd &gt;= eventLoop-&gt;setsize) &#123;</span><br><span class="line">        errno = ERANGE;</span><br><span class="line">        <span class="keyword">return</span> AE_ERR;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">//取出对应的aeFileEvent事件</span></span><br><span class="line">    aeFileEvent *fe = &amp;eventLoop-&gt;events[fd];</span><br><span class="line"></span><br><span class="line">    <span class="comment">//添加读写事件到不同的模型</span></span><br><span class="line">    <span class="keyword">if</span> (aeApiAddEvent(eventLoop, fd, mask) == <span class="number">-1</span>)</span><br><span class="line">        <span class="keyword">return</span> AE_ERR;</span><br><span class="line">    <span class="comment">//文件类型按位或</span></span><br><span class="line">    fe-&gt;mask |= mask;</span><br><span class="line">    <span class="comment">//根据最终的类型设置读写回调函数</span></span><br><span class="line">    <span class="keyword">if</span> (mask &amp; AE_READABLE) fe-&gt;rfileProc = proc;</span><br><span class="line">    <span class="keyword">if</span> (mask &amp; AE_WRITABLE) fe-&gt;wfileProc = proc;</span><br><span class="line">    <span class="comment">//fe中读写操作的clientdata</span></span><br><span class="line">    fe-&gt;clientData = clientData;</span><br><span class="line">    <span class="comment">//如果fd大于当前最大的eventLoop maxfdfd</span></span><br><span class="line">    <span class="keyword">if</span> (fd &gt; eventLoop-&gt;maxfd)</span><br><span class="line">        eventLoop-&gt;maxfd = fd;</span><br><span class="line">    <span class="keyword">return</span> AE_OK;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p> <code>删除监听事件</code></p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">aeDeleteFileEvent</span><span class="params">(aeEventLoop *eventLoop, <span class="keyword">int</span> fd, <span class="keyword">int</span> mask)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (fd &gt;= eventLoop-&gt;setsize) <span class="keyword">return</span>;</span><br><span class="line">    aeFileEvent *fe = &amp;eventLoop-&gt;events[fd];</span><br><span class="line">    <span class="keyword">if</span> (fe-&gt;mask == AE_NONE) <span class="keyword">return</span>;</span><br><span class="line">    <span class="comment">//网络模型里删除对应的事件</span></span><br><span class="line">    aeApiDelEvent(eventLoop, fd, mask);</span><br><span class="line">    <span class="comment">//清除对应的类型标记</span></span><br><span class="line">    fe-&gt;mask = fe-&gt;mask &amp; (~mask);</span><br><span class="line">    <span class="comment">//如果删除的fd是maxfd，并且对应的事件为空，那么更新maxfd</span></span><br><span class="line">    <span class="keyword">if</span> (fd == eventLoop-&gt;maxfd &amp;&amp; fe-&gt;mask == AE_NONE) &#123;</span><br><span class="line">        <span class="comment">/* Update the max fd */</span></span><br><span class="line">        <span class="keyword">int</span> j;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">for</span> (j = eventLoop-&gt;maxfd<span class="number">-1</span>; j &gt;= <span class="number">0</span>; j--)</span><br><span class="line">            <span class="keyword">if</span> (eventLoop-&gt;events[j].mask != AE_NONE) <span class="keyword">break</span>;</span><br><span class="line">        eventLoop-&gt;maxfd = j;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//获取文件类型</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">aeGetFileEvents</span><span class="params">(aeEventLoop *eventLoop, <span class="keyword">int</span> fd)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">if</span> (fd &gt;= eventLoop-&gt;setsize) <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">    aeFileEvent *fe = &amp;eventLoop-&gt;events[fd];</span><br><span class="line">    <span class="comment">//返回对应的类型标记</span></span><br><span class="line">    <span class="keyword">return</span> fe-&gt;mask;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><code>事件派发函数</code></p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//派发事件的函数</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">aeProcessEvents</span><span class="params">(aeEventLoop *eventLoop, <span class="keyword">int</span> flags)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">int</span> processed = <span class="number">0</span>, numevents;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* Nothing to do? return ASAP */</span></span><br><span class="line">    <span class="keyword">if</span> (!(flags &amp; AE_TIME_EVENTS) &amp;&amp; !(flags &amp; AE_FILE_EVENTS)) <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">   </span><br><span class="line">    <span class="comment">//为了休眠，直到有时间事件触发，即便是没有文件事件处理，我们也会</span></span><br><span class="line">    <span class="comment">//调用对应的事件时间</span></span><br><span class="line">    <span class="comment">//这部分不是很清楚，知道大体意思是设置时间，</span></span><br><span class="line">    <span class="comment">//为了aeApiPoll设置等待的时间</span></span><br><span class="line">    <span class="keyword">if</span> (eventLoop-&gt;maxfd != <span class="number">-1</span> ||</span><br><span class="line">        ((flags &amp; AE_TIME_EVENTS) &amp;&amp; !(flags &amp; AE_DONT_WAIT))) &#123;</span><br><span class="line">        <span class="keyword">int</span> j;</span><br><span class="line">        aeTimeEvent *shortest = <span class="literal">NULL</span>;</span><br><span class="line">        <span class="class"><span class="keyword">struct</span> <span class="title">timeval</span> <span class="title">tv</span>, *<span class="title">tvp</span>;</span></span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (flags &amp; AE_TIME_EVENTS &amp;&amp; !(flags &amp; AE_DONT_WAIT))</span><br><span class="line">            shortest = aeSearchNearestTimer(eventLoop);</span><br><span class="line">        <span class="keyword">if</span> (shortest) &#123;</span><br><span class="line">            <span class="keyword">long</span> now_sec, now_ms;</span><br><span class="line"></span><br><span class="line">            <span class="comment">/* Calculate the time missing for the nearest</span></span><br><span class="line"><span class="comment">             * timer to fire. */</span></span><br><span class="line">            aeGetTime(&amp;now_sec, &amp;now_ms);</span><br><span class="line">            tvp = &amp;tv;</span><br><span class="line">            tvp-&gt;tv_sec = shortest-&gt;when_sec - now_sec;</span><br><span class="line">            <span class="keyword">if</span> (shortest-&gt;when_ms &lt; now_ms) &#123;</span><br><span class="line">                tvp-&gt;tv_usec = ((shortest-&gt;when_ms+<span class="number">1000</span>) - now_ms)*<span class="number">1000</span>;</span><br><span class="line">                tvp-&gt;tv_sec --;</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                tvp-&gt;tv_usec = (shortest-&gt;when_ms - now_ms)*<span class="number">1000</span>;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">if</span> (tvp-&gt;tv_sec &lt; <span class="number">0</span>) tvp-&gt;tv_sec = <span class="number">0</span>;</span><br><span class="line">            <span class="keyword">if</span> (tvp-&gt;tv_usec &lt; <span class="number">0</span>) tvp-&gt;tv_usec = <span class="number">0</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="comment">/* If we have to check for events but need to return</span></span><br><span class="line"><span class="comment">             * ASAP because of AE_DONT_WAIT we need to set the timeout</span></span><br><span class="line"><span class="comment">             * to zero */</span></span><br><span class="line">            <span class="keyword">if</span> (flags &amp; AE_DONT_WAIT) &#123;</span><br><span class="line">                tv.tv_sec = tv.tv_usec = <span class="number">0</span>;</span><br><span class="line">                tvp = &amp;tv;</span><br><span class="line">            &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">                <span class="comment">/* Otherwise we can block */</span></span><br><span class="line">                tvp = <span class="literal">NULL</span>; <span class="comment">/* wait forever */</span></span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">//调用不同的网络模型poll事件</span></span><br><span class="line">        numevents = aeApiPoll(eventLoop, tvp);</span><br><span class="line">        <span class="keyword">for</span> (j = <span class="number">0</span>; j &lt; numevents; j++) &#123;</span><br><span class="line">            <span class="comment">//轮询处理就绪事件</span></span><br><span class="line">            aeFileEvent *fe = &amp;eventLoop-&gt;events[eventLoop-&gt;fired[j].fd];</span><br><span class="line">            <span class="keyword">int</span> mask = eventLoop-&gt;fired[j].mask;</span><br><span class="line">            <span class="keyword">int</span> fd = eventLoop-&gt;fired[j].fd;</span><br><span class="line">            <span class="keyword">int</span> rfired = <span class="number">0</span>;</span><br><span class="line">            <span class="comment">//可读就绪事件</span></span><br><span class="line">            <span class="keyword">if</span> (fe-&gt;mask &amp; mask &amp; AE_READABLE) &#123;</span><br><span class="line">                rfired = <span class="number">1</span>;</span><br><span class="line">                fe-&gt;rfileProc(eventLoop,fd,fe-&gt;clientData,mask);</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="comment">//可写就绪事件</span></span><br><span class="line">            <span class="keyword">if</span> (fe-&gt;mask &amp; mask &amp; AE_WRITABLE) &#123;</span><br><span class="line">                <span class="keyword">if</span> (!rfired || fe-&gt;wfileProc != fe-&gt;rfileProc)</span><br><span class="line">                    fe-&gt;wfileProc(eventLoop,fd,fe-&gt;clientData,mask);</span><br><span class="line">            &#125;</span><br><span class="line">            processed++;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* Check time events */</span></span><br><span class="line">    <span class="comment">//处理所有定时器事件</span></span><br><span class="line">    <span class="keyword">if</span> (flags &amp; AE_TIME_EVENTS)</span><br><span class="line">        processed += processTimeEvents(eventLoop);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> processed; <span class="comment">/* return the number of processed file/time events */</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">/等待millionseconds，直到有可读或者可写事件触发</span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">aeWait</span><span class="params">(<span class="keyword">int</span> fd, <span class="keyword">int</span> mask, <span class="keyword">long</span> <span class="keyword">long</span> milliseconds)</span> </span>&#123;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">pollfd</span> <span class="title">pfd</span>;</span></span><br><span class="line">    <span class="keyword">int</span> retmask = <span class="number">0</span>, retval;</span><br><span class="line"></span><br><span class="line">    <span class="built_in">memset</span>(&amp;pfd, <span class="number">0</span>, <span class="keyword">sizeof</span>(pfd));</span><br><span class="line">    pfd.fd = fd;</span><br><span class="line">    <span class="keyword">if</span> (mask &amp; AE_READABLE) pfd.events |= POLLIN;</span><br><span class="line">    <span class="keyword">if</span> (mask &amp; AE_WRITABLE) pfd.events |= POLLOUT;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">if</span> ((retval = poll(&amp;pfd, <span class="number">1</span>, milliseconds))== <span class="number">1</span>) &#123;</span><br><span class="line">        <span class="keyword">if</span> (pfd.revents &amp; POLLIN) retmask |= AE_READABLE;</span><br><span class="line">        <span class="keyword">if</span> (pfd.revents &amp; POLLOUT) retmask |= AE_WRITABLE;</span><br><span class="line">    <span class="keyword">if</span> (pfd.revents &amp; POLLERR) retmask |= AE_WRITABLE;</span><br><span class="line">        <span class="keyword">if</span> (pfd.revents &amp; POLLHUP) retmask |= AE_WRITABLE;</span><br><span class="line">        <span class="keyword">return</span> retmask;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> retval;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//ae主函数</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">aeMain</span><span class="params">(aeEventLoop *eventLoop)</span> </span>&#123;</span><br><span class="line">    <span class="comment">//stop初始为0</span></span><br><span class="line">    eventLoop-&gt;stop = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">while</span> (!eventLoop-&gt;stop) &#123;</span><br><span class="line">        <span class="comment">//调用beforesleep函数</span></span><br><span class="line">        <span class="keyword">if</span> (eventLoop-&gt;beforesleep != <span class="literal">NULL</span>)</span><br><span class="line">            eventLoop-&gt;beforesleep(eventLoop);</span><br><span class="line">        <span class="comment">//派发所有的事件</span></span><br><span class="line">        aeProcessEvents(eventLoop, AE_ALL_EVENTS);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//获取api名字</span></span><br><span class="line"><span class="function"><span class="keyword">char</span> *<span class="title">aeGetApiName</span><span class="params">(<span class="keyword">void</span>)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> aeApiName();</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//sleep之前的回调函数</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">aeSetBeforeSleepProc</span><span class="params">(aeEventLoop *eventLoop, aeBeforeSleepProc *beforesleep)</span> </span>&#123;</span><br><span class="line">    eventLoop-&gt;beforesleep = beforesleep;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>这就是ae文件里大体的几个api，其他的没理解的还在研究。</p>

      
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            var keywords = searchText.split(/[\s\-]+/);
            if (keywords.length > 1) {
              keywords.push(searchText);
            }
            var resultItems = [];
            if (searchText.length > 0) {
              // perform local searching
              datas.forEach(function(data) {
                var isMatch = false;
                var hitCount = 0;
                var searchTextCount = 0;
                var title = data.title.trim();
                var titleInLowerCase = title.toLowerCase();
                var content = data.content.trim().replace(/<[^>]+>/g,"");
                var contentInLowerCase = content.toLowerCase();
                var articleUrl = decodeURIComponent(data.url);
                var indexOfTitle = [];
                var indexOfContent = [];
                // only match articles with not empty titles
                if(title != '') {
                  keywords.forEach(function(keyword) {
                    function getIndexByWord(word, text, caseSensitive) {
                      var wordLen = word.length;
                      if (wordLen === 0) {
                        return [];
                      }
                      var startPosition = 0, position = [], index = [];
                      if (!caseSensitive) {
                        text = text.toLowerCase();
                        word = word.toLowerCase();
                      }
                      while ((position = text.indexOf(word, startPosition)) > -1) {
                        index.push({position: position, word: word});
                        startPosition = position + wordLen;
                      }
                      return index;
                    }

                    indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
                    indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
                  });
                  if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
                    isMatch = true;
                    hitCount = indexOfTitle.length + indexOfContent.length;
                  }
                }

                // show search results

                if (isMatch) {
                  // sort index by position of keyword

                  [indexOfTitle, indexOfContent].forEach(function (index) {
                    index.sort(function (itemLeft, itemRight) {
                      if (itemRight.position !== itemLeft.position) {
                        return itemRight.position - itemLeft.position;
                      } else {
                        return itemLeft.word.length - itemRight.word.length;
                      }
                    });
                  });

                  // merge hits into slices

                  function mergeIntoSlice(text, start, end, index) {
                    var item = index[index.length - 1];
                    var position = item.position;
                    var word = item.word;
                    var hits = [];
                    var searchTextCountInSlice = 0;
                    while (position + word.length <= end && index.length != 0) {
                      if (word === searchText) {
                        searchTextCountInSlice++;
                      }
                      hits.push({position: position, length: word.length});
                      var wordEnd = position + word.length;

                      // move to next position of hit

                      index.pop();
                      while (index.length != 0) {
                        item = index[index.length - 1];
                        position = item.position;
                        word = item.word;
                        if (wordEnd > position) {
                          index.pop();
                        } else {
                          break;
                        }
                      }
                    }
                    searchTextCount += searchTextCountInSlice;
                    return {
                      hits: hits,
                      start: start,
                      end: end,
                      searchTextCount: searchTextCountInSlice
                    };
                  }

                  var slicesOfTitle = [];
                  if (indexOfTitle.length != 0) {
                    slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
                  }

                  var slicesOfContent = [];
                  while (indexOfContent.length != 0) {
                    var item = indexOfContent[indexOfContent.length - 1];
                    var position = item.position;
                    var word = item.word;
                    // cut out 100 characters
                    var start = position - 20;
                    var end = position + 80;
                    if(start < 0){
                      start = 0;
                    }
                    if (end < position + word.length) {
                      end = position + word.length;
                    }
                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('1');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  

  
  

  

  

  

</body>
</html>
